Vehicle power supply system and method and vehicle

Abstract

The invention relates to a vehicle power supply system and method and a vehicle, and the vehicle power supply system comprises a primary power supply system which is used for supplying power to a plurality of secondary power supply systems; the plurality of secondary power supply systems are respectively used for carrying out voltage reduction processing on the electric energy provided by the primary power supply systems to obtain the electric energy after voltage reduction, and the electric energy after voltage reduction is used for supplying power to respective secondary loads; each secondary power supply system comprises an acquisition module and a control module; the acquisition module is used for acquiring power supply information of a secondary power supply system and sending the power supply information to the control module; the power supply information comprises at least one of current information, voltage information and temperature information of a circuit in the secondary power supply system; the control module is used for determining whether a circuit of the secondary power supply system is abnormal or not according to the power supply information, and executing corresponding protection operation under the condition of determining that the circuit is abnormal; the protection operation comprises at least one of a circuit turn-off operation, an output power adjustment operation and an early warning operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a vehicle power supply system, method and vehicle. BACKGROUND

[0002] Modern vehicle electrical systems are increasingly complex, especially in electric vehicles and hybrid vehicles, the stability and safety of the power supply system are crucial to the operation of the vehicle. In the current related power distribution mode, the 12V power supply network in the 48V power distribution system is usually used as the power supply mode of the secondary power supply network; however, such a scheme cannot realize the separate power supply of different regional loads, and relies on the protection mechanism at the overall system level, lacking independent control capability. SUMMARY

[0003] The embodiments of the present application provide a vehicle power supply system, method and vehicle, which can realize independent secondary power supply network power distribution and fault protection, greatly improving the safety of the vehicle power supply network.

[0004] In a first aspect, the embodiments of the present application provide a vehicle power supply system, comprising: a primary power supply system, configured to supply power to a plurality of secondary power supply systems; a plurality of secondary power supply systems, each configured to perform voltage reduction on the power provided by the primary power supply system to obtain reduced voltage power, and supply the reduced voltage power to a respective secondary load; wherein each secondary power supply system comprises an acquisition module and a control module; the acquisition module is configured to acquire power supply information of the secondary power supply system and send the power supply information to the control module; wherein the power supply information comprises at least one of current information, voltage information and temperature information of a circuit in the secondary power supply system; the control module is configured to determine whether the circuit of the secondary power supply system is abnormal according to the power supply information, and perform a corresponding protection operation in the case of determining that the circuit is abnormal; wherein the protection operation comprises at least one of a circuit shutdown operation, an output power adjustment operation and a warning operation.

[0005] In the embodiment, multiple secondary power supply systems are arranged, each of which can step down the power provided by the primary power supply system to supply power to the respective secondary load, so that the power distribution of the independent secondary power supply network can be realized; meanwhile, since the acquisition module and the control module are arranged in each secondary power supply system, the power supply information in the power supply process of each secondary power supply system can be acquired by the acquisition module, and then the power supply circuit of the current secondary power supply system is detected and analyzed by the control module of each secondary power supply system to determine whether the power supply circuit is abnormal, if the power supply circuit is abnormal, the corresponding protection operation is controlled to be performed, including any one of the operations of circuit shutdown, output power adjustment and early warning, so that the independent fault detection and protection of each secondary power supply system are realized, and the safety of the power supply network of the whole vehicle is greatly improved.

[0006] Further, in some embodiments of the present application, the secondary power supply system comprises a conversion circuit; the conversion circuit comprises a conversion controller and a power device array; The control module is further configured to send an updated duty cycle parameter to the conversion controller in a case where it is determined to perform the output power adjustment operation. The conversion controller is configured to control the on-time of each power device in the power device array according to the updated duty cycle parameter to adjust the output power of the secondary power supply system.

[0007] In the embodiment, the conversion circuit in each secondary power supply system comprises a conversion controller and a power device array, when the control module determines that the output power needs to be adjusted, an updated duty cycle parameter can be sent to the conversion controller, and then the on-time of each power device in the power device array is controlled by the conversion controller, so that the power adjustment is completed, and the adaptive adjustment of the output power of the secondary power supply system can be realized.

[0008] Further, in some embodiments of the present application, the secondary power supply system comprises an auxiliary power supply and a driving circuit; the auxiliary power supply comprises a primary power supply, a secondary power supply and an isolation power supply; The primary power supply is configured to supply power to the secondary power supply and the isolation power supply. The secondary power supply is configured to supply power to the control module and the acquisition module. The isolation power supply is configured to supply power to the driving circuit.

[0009] In the embodiment, each secondary power supply system comprises an auxiliary power supply for supplying power to some devices or units inside the secondary power supply system, wherein the auxiliary power supply can comprise a primary power supply, a secondary power supply and an isolation power supply, when powered by the auxiliary power supply, the secondary power supply and the isolation power supply can be powered by the primary power supply, the control module and the acquisition module can be powered by the secondary power supply, and the driving circuit can be powered by the isolation power supply, so as to guarantee the independent normal operation of the secondary power supply system.

[0010] Further, in some embodiments of the present application, the driving circuit comprises a protection control port and an output transistor. The control module is further configured to send a first level signal to the protection control port when it is determined to perform the circuit off operation, and to send a second level signal to the protection control port when it is determined to perform the circuit on operation, wherein the voltage value of the first level signal is less than the voltage value of the second level signal. The driving circuit is configured to trigger the output transistor to be off in response to the first level signal to complete the off operation of the output circuit, and to trigger the output transistor to be on in response to the second level signal to complete the on operation of the output circuit.

[0011] In the embodiment, when the circuit off operation needs to be performed, the control module can send the first level signal to the protection control port in the driving circuit, so that the driving circuit can trigger the output transistor to be off in response to the first level signal to complete the off operation of the output circuit; when the control module determines that the circuit on operation needs to be performed, the control module can send the second level signal to the protection control port in the driving circuit, so that the driving circuit can trigger the output transistor to be on in response to the second level signal to complete the on operation of the output circuit, the voltage value of the first level signal is less than the voltage value of the second level signal, that is, the driving circuit can control the circuit to be on in response to the high level signal sent by the control module, and control the circuit to be off in response to the low level signal sent by the control module, thereby realizing the on and off of the power supply circuit of the secondary power supply system.

[0012] Further, in some embodiments of the present application, the driving circuit further comprises a first transistor, a second transistor, a third transistor and a first diode; the gate of the output transistor is connected to the first transistor, the first diode is connected to the output positive voltage end of the isolation power supply, the drain of the output transistor is connected to the first power supply pin, and the first power supply pin is the output power supply pin of the conversion circuit; the protection control port is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the first diode, the collector of the third transistor is connected to the output ground end of the isolation power supply, and the emitter of the third transistor is connected to the gate of the output transistor. The second transistor is configured to trigger the output transistor to be off in response to the first level signal. a first transistor, configured to be triggered off in response to the second transistor being turned off, so that the emitter and the base of the first transistor are in a no-voltage-difference state; a third transistor, configured to be triggered on in response to a residual voltage existing at the gate of the output transistor, so that the emitter and the base of the third transistor are in a voltage-difference state; the output transistor, configured to be turned off after the residual voltage is discharged in response to the third transistor being turned on.

[0013] In this embodiment, when the circuit needs to be turned off, the second transistor connected to the protection control port is triggered off in response to the first level signal, so that the emitter and the base of the first transistor are in a no-voltage-difference state, the first transistor is turned off, and the emitter and the base of the third transistor are in a voltage-difference state due to the residual voltage existing at the gate of the output transistor which is turned on previously, the third transistor is turned on, and the output transistor is turned off after the residual voltage is discharged based on the third transistor being turned on, thereby realizing the turning-off operation of the output circuit; when the output circuit is abnormal, the circuit can be quickly turned off in the above manner, and the safety of vehicle power supply is improved.

[0014] Further, in some embodiments of the present application, the second transistor is configured to be turned on in response to the second level signal; the first transistor, configured to be triggered on in response to the second transistor being turned on, so that the emitter and the base of the first transistor are in a voltage-difference state; the output transistor, configured to be triggered on in a high-level state of the gate voltage of the output transistor by obtaining the output voltage of the isolated power supply through the first transistor and the first diode when the first transistor is turned on.

[0015] In this embodiment, the gate of the output transistor in the driving circuit is connected to the output positive voltage end of the isolated power supply through the first transistor and the first diode, and the drain is connected to the first power supply pin, so that when the output transistor is triggered on, the isolated power supply can provide stable power for the output transistor, realizing the stable and constant-on of the output transistor; when the output transistor is triggered on, the output transistor is triggered on based on the states of the first transistor, the second transistor and the third transistor in the driving circuit, thereby effectively controlling the turning-on of the circuit.

[0016] Further, in some embodiments of the present application, the secondary power supply system further comprises a communication module; the control module, configured to send a warning signal to the processor of the vehicle through the communication module in a case where it is determined to perform a warning operation, so that the processor performs a warning prompt process according to the warning signal.

[0017] In the embodiments of the present application, when the pre-warning operation needs to be performed, the control module can send a pre-warning signal to the processor of the vehicle through the communication module, so that the processor can perform corresponding pre-warning prompt processing, the circuit failure can be timely reminded, and the intelligence of the vehicle is improved.

[0018] Further, in some embodiments of the present application, the plurality of secondary power supply systems include a first power supply system deployed in the front compartment of the vehicle, a second power supply system deployed in the middle compartment of the vehicle, and a third power supply system deployed in the rear compartment of the vehicle.

[0019] In the embodiments, the first power supply system can be deployed in the front compartment of the vehicle, the second power supply system can be deployed in the middle compartment of the vehicle, and the third power supply system can be deployed in the rear compartment of the vehicle, so that the secondary load in the front compartment can be powered by the first power supply system, the secondary load in the middle compartment can be powered by the second power supply system, and the secondary load in the rear compartment can be powered by the third power supply system, thereby realizing separate power supply control of different regions of the front, middle and rear compartments of the vehicle, and greatly improving the power supply safety of the vehicle.

[0020] In a second aspect, the embodiments of the present application provide a power supply control method applied to a vehicle power supply system, the vehicle power supply system including a primary power supply system and a plurality of secondary power supply systems; the method includes: The plurality of secondary power supply systems respectively perform step-down processing on the electrical energy provided by the primary power supply system to obtain step-down electrical energy, and supply power to their own secondary loads by using the step-down electrical energy; wherein each secondary power supply system includes a collection module and a control module; The collection module collects power supply information of the secondary power supply system and sends the power supply information to the control module; wherein the power supply information includes at least one of current information, voltage information and temperature information of the circuit in the secondary power supply system; The control module determines whether the circuit of the secondary power supply system is abnormal according to the power supply information, and performs corresponding protection operation in the case of determining that there is an abnormality; wherein the protection operation includes at least one of circuit shutdown operation, output power adjustment operation and pre-warning operation.

[0021] In the embodiment of the present application, each secondary power supply system can step down the power provided by the primary power supply system to supply power to the respective secondary load, thereby achieving power distribution of the mutually independent secondary power supply network; at the same time, since the acquisition module and the control module are arranged in each secondary power supply system, the acquisition module can be used to acquire the power supply information in the power supply process of each secondary power supply system, and then the control module of each secondary power supply system can be used to detect and analyze the power supply circuit of the current secondary power supply system to determine whether the power supply circuit is abnormal, if there is an abnormality, control to perform any one of the operations including circuit shutdown, adjusting output power and pre-warning, realizing independent fault detection and protection of each secondary power supply system, greatly improving the safety of the power supply network of the whole vehicle.

[0022] In a third aspect, the embodiment of the present application provides a vehicle, comprising a vehicle power supply system, the vehicle power supply system being used to execute the control method of the vehicle power supply system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The composition structure of the vehicle power supply system provided by the embodiment of the present application is shown in Figure 1 ; Figure 2 The composition structure of the secondary power supply system provided by the embodiment of the present application is shown in Figure 3 The circuit structure of the conversion circuit provided by the embodiment of the present application is shown in Figure 4 The implementation flowchart of the control method of the vehicle power supply system provided by the embodiment of the present application is shown in Figure 5 The composition structure of the vehicle power supply system provided by the embodiment of the present application is shown in Figure 2 ; Figure 6 The composition structure of the vehicle power supply system provided by the embodiment of the present application is shown in Figure 3 ; Figure 7 The protection logic of the secondary power supply system provided by the embodiment of the present application is shown in Figure 8 The circuit structure of the driving circuit provided by the embodiment of the present application is shown in Figure 9 The implementation flowchart of the circuit abnormality detection provided by the embodiment of the present application is shown in Figure 10 The circuit structure of the primary power supply and the secondary power supply provided by the embodiment of the present application is shown in Figure 11 The circuit structure of the isolation power supply provided by the embodiment of the present application is shown in Figure 12 The circuit structure schematic diagram of the control module provided in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Other advantages and effects of the present application can be easily understood by those skilled in the art from the description disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the present specification based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0025] In the following description, "some embodiments" are related to a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0026] In the related power distribution method of the current vehicle, the power distribution is mainly divided by power, and the protection problem under the abnormal condition of parallel wiring of the vehicle primary power supply and the secondary power supply is not solved, for example, the problem of wire harness damage and string electricity; for the protection method of some power distribution circuits, the protection problem is mainly solved in the way of redundant system, and although this way can solve the protection problem, the implementation cost is high, which is not conducive to popularization.

[0027] In order to solve the above problems, in the embodiment of the present application, a vehicle power supply system is provided, which comprises a primary power supply system for supplying power to a plurality of secondary power supply systems; a plurality of secondary power supply systems are respectively used for step-down processing the electric energy provided by the primary power supply system to obtain step-down electric energy, and supplying power to respective secondary loads by using the step-down electric energy; wherein each secondary power supply system comprises a collection module and a control module; the collection module is used for collecting power supply information of the secondary power supply system and sending the power supply information to the control module; wherein the power supply information comprises at least one of current information, voltage information and temperature information of the circuit in the secondary power supply system; the control module is used for determining whether the circuit of the secondary power supply system is abnormal according to the power supply information, and performing corresponding protection operation in the case of determining that there is an abnormality; wherein the protection operation comprises at least one of circuit shutdown operation, output power adjustment operation and early warning operation. Based on the above scheme, the secondary power supply network power distribution and fault protection can be realized independently, which greatly improves the safety of the power supply network of the whole vehicle.

[0028] The description of the control method of the vehicle power supply system in the embodiments of the present application is similar to that of the vehicle power supply system, has similar beneficial effects, and therefore will not be described again. For technical details not disclosed in the control method of the vehicle power supply system, please refer to the description of the vehicle power supply system in the embodiments of the present application.

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0030] Based on the above embodiments, in another embodiment of the present application, Figure 1 The vehicle power supply system provided in the embodiments of the present application has the component structure as shown in the figure. Figure 1 As shown in the figure, Figure 1 Taking three secondary power supply systems as an example, the vehicle power supply system provided in the embodiments of the present application can include a primary power supply system 101 and a plurality of secondary power supply systems 102; wherein each secondary power supply system 102 can include an acquisition module 1021 and a control module 1022.

[0031] The primary power supply system 11 is configured to supply power to the plurality of secondary power supply systems.

[0032] In the embodiments of the present application, the primary power supply system can be a main power supply system directly provided by a 48V battery or a total electronic control unit in the vehicle, configured to provide initial power to each secondary power supply system; for example, the primary power supply system can be a central power distribution system integrated with a large-capacity lithium battery pack and a total electronic control unit.

[0033] The plurality of secondary power supply systems 12 are respectively configured to perform voltage reduction processing on the power provided by the primary power supply system, obtain reduced voltage, and supply power to respective secondary loads by using the reduced voltage; wherein each secondary power supply system includes an acquisition module and a control module.

[0034] In the embodiments of the present application, the secondary power supply system can be a subsystem supplied by the primary power supply system, and through DC-DC voltage reduction processing, the 48V voltage is reduced to 12V or other low voltage levels for use by controllers or loads in a specific area.

[0035] In some embodiments of this application, the multiple secondary power supply systems may include a first power supply system deployed in the front compartment of the vehicle, a second power supply system deployed in the middle compartment of the vehicle, and a third power supply system deployed in the rear compartment of the vehicle; wherein, the front compartment refers to the area in front of the driver's cab where mechanical components are installed, and typically includes equipment such as the engine, radiator, and air conditioning compressor; the middle compartment typically refers to the central area where the driver's cab is located, and includes key electronic equipment such as the instrument panel, multimedia system, and door control module; the rear compartment typically refers to the luggage compartment or trunk area at the rear of the vehicle, where equipment such as on-board chargers, reversing camera systems, and taillight control modules are often installed.

[0036] In the embodiments of this application, the secondary power supply area of ​​the vehicle is divided into three independent physical spaces: the front compartment, the middle compartment, and the rear compartment. Each compartment is equipped with an independent secondary power supply system. In this way, electrical isolation between different areas can be achieved, avoiding the risk of cross-current caused by cross wiring harnesses, while improving the modularity and maintainability of the system.

[0037] The acquisition module is used to acquire power supply information of the secondary power supply system and send the power supply information to the control module; wherein, the power supply information includes at least one of the current information, voltage information and temperature information of the circuit in the secondary power supply system.

[0038] In some embodiments of this application, the acquisition module can obtain voltage information through a resistor divider, obtain current information through a differential circuit built with an operational amplifier, and acquire temperature data through a thermistor or similar means. The acquired information is then transmitted to the control module for analysis and judgment. The design of the acquisition module enables the system to have real-time monitoring capabilities, providing data support for subsequent fault detection and protection operations.

[0039] In some embodiments of this application, the power supply information collected by the acquisition module typically includes, but is not limited to, current values, voltage values, and temperature values. This information reflects the operating status of the power supply system. For example, current refers to the amount of charge flowing through a circuit per unit time, commonly measured in amperes (A); voltage is the potential difference between two points, commonly measured in volts (V); and temperature refers to the thermodynamic state of the system's operating environment or the surface of a component, commonly measured in degrees Celsius (°C). The acquisition of this information is crucial for determining whether the power supply circuit is in a normal state.

[0040] Understandably, the acquisition module can collect key electrical parameters such as current, voltage, and temperature in the secondary power supply system in real time and transmit these data to the control module for analysis and processing.

[0041] The control module is configured to determine whether the circuit of the secondary power supply system is abnormal according to the power supply information, and perform a corresponding protection operation if it is determined that the circuit is abnormal; wherein the protection operation comprises at least one of a circuit shutdown operation, an output power adjustment operation, and a pre-warning operation.

[0042] In embodiments of the present application, the control module is a core control unit of the secondary power supply system, and can be a microcontroller unit (MCU).

[0043] In some embodiments of the present application, the control module is further configured to compare the current information with a preset current threshold to determine whether the output circuit of the secondary power supply system is overcurrent; compare the voltage information with a preset voltage threshold to determine whether the circuit of the secondary power supply system is overvoltage or undervoltage; compare the temperature information with a preset temperature threshold to determine whether the circuit of the secondary power supply system is overtemperature; and compare the power information with a preset power threshold to determine whether the circuit of the secondary power supply system is overload.

[0044] In embodiments of the present application, the preset current threshold is set according to the rated current and safety margin of each device in the output circuit of the secondary power supply system, such as a metal-oxide-semiconductor field-effect transistor (MOSFET), a wire, a load, etc.; for example, 80%-90% of the rated current of the device can be taken as the preset current threshold.

[0045] In embodiments of the present application, the preset voltage threshold can include an overvoltage threshold and an undervoltage threshold; the overvoltage threshold can be determined according to the maximum tolerance voltage of each electrical device in the secondary power supply system, combined with the voltage fluctuation range; for example, it can be set to 110%-120% of the rated voltage; the undervoltage threshold can be set according to the minimum voltage requirement for normal operation of the electrical device, for example, it can be 80%-90% of the rated voltage.

[0046] In embodiments of the present application, the preset temperature threshold can be determined according to the junction temperature safety limit of the key heat generating device (such as a DCDC controller, a power MOS tube, etc.) in the secondary power supply system, combined with the heat dissipation condition; for example, the preset temperature threshold can be set to about 80% of the maximum allowed junction temperature of the device.

[0047] In embodiments of the present application, the preset power threshold can be determined according to the rated output power of the secondary power supply system; for example, it can be 90%-95% of the rated power.

[0048] In some embodiments of this application, when the current information is greater than a preset current threshold, the control module can determine that there is an overcurrent in the output circuit of the secondary power supply system.

[0049] In some embodiments of this application, when the voltage information is greater than the overvoltage threshold, the control module can determine that there is an overvoltage in the output circuit of the secondary power supply system.

[0050] In some embodiments of this application, when the voltage information is less than the undervoltage threshold, the control module can determine that there is an undervoltage in the output circuit of the secondary power supply system.

[0051] In some embodiments of this application, when the temperature information is greater than a preset temperature threshold, the control module can determine that the output circuit of the secondary power supply system is overheated.

[0052] In some embodiments of this application, the control module determines the power information based on voltage and current information; when the power information is greater than a preset power threshold, the control module can determine that the output circuit of the secondary power supply system is overloaded.

[0053] In the embodiments of this application, the types of abnormalities may include overvoltage, undervoltage, overcurrent, overload, and overtemperature; the control module can be used to determine the appropriate protection operation to be performed based on the type of abnormality when it is determined that there is an abnormality in the circuit of the secondary power supply system.

[0054] In some embodiments of this application, the control module can be used to determine to perform a circuit shutdown operation and / or a warning operation when the type of abnormality is overvoltage or undervoltage; to determine to perform an output power adjustment operation and / or a circuit shutdown operation and / or a warning operation when the type of abnormality is overcurrent or overload; and to determine to perform an output power adjustment operation and / or a circuit shutdown operation when the type of abnormality is overtemperature.

[0055] In some embodiments of this application, such as Figure 2 As shown, the secondary power supply system also includes a conversion circuit 1023, an auxiliary power supply 1024, a drive circuit 1025, and a communication module 1026. In some embodiments of this application, the conversion circuit can be a core circuit structure that realizes voltage conversion between 48V and 12V, responsible for converting the input 48V DC voltage into a stable 12V output voltage suitable for the downstream load; the conversion circuit has the function of adjusting the output power; by setting the conversion circuit, the electrical connection between the primary power supply (48V) and the secondary power supply (12V) can be effectively isolated, avoiding the risk of cross-current caused by wiring crossover. At the same time, the circuit can also realize independent voltage regulation and fault isolation for each area, improving the safety and reliability of the vehicle power network.

[0056] In some embodiments of the present application, the conversion circuit can include a conversion controller and a power device array; the conversion controller is a core control unit in the conversion circuit, used to receive instruction signals from the control module, and dynamically adjust the working state of the power device according to the current load state; the power device array is composed of a plurality of power switching devices (such as MOSFET), used to realize high-frequency switching operation, so as to complete the voltage reduction and power regulation; by combining the conversion controller with the power device array, the conduction and turn-off of each power device can be flexibly controlled, and the output power can be accurately managed. This structure design not only improves the response speed of the system, but also enhances the rapid reaction ability under abnormal working conditions, and improves the robustness of the overall power supply system.

[0057] Exemplarily, as shown in Figure 3 The conversion circuit can include a conversion controller, a power device array, and some capacitors, inductors, diodes, and resistors; among them, the three capacitors numbered 9, 10, and 11 are electrolytic capacitors, and the two capacitors numbered 12 and 13 are ceramic capacitors; the conversion controller can be a chip, which can include multiple ports and pins, such as a mode control port, a serial peripheral interface (SPI) port, and a fault feedback port. The SPI port can include four ports: SPI_CS, SPI_SCL, SPI_SDA, and SPI_CLK. Through the mode control port and the SPI port, the control module can receive updated duty cycle parameters to control the power output; VBAT_48V is an input power pin connected to a 48V DC input voltage; V_AWO is also a power pin, used to charge the self-capacitor numbered 5, so that the transistors numbered 2, 3, and 4 in the power device array are turned on; VBAT_12V is an output power pin, which can output a stable 12V DC voltage after voltage reduction conversion; GND is a ground pin, which provides a common reference ground for the entire circuit to ensure stable circuit potential.

[0058] In an embodiment of the present application, the control module is further configured to send an updated duty cycle parameter to the conversion controller if it is determined to perform the output power adjustment operation; the conversion controller is configured to control the conduction time of each power device in the power device array according to the updated duty cycle parameter, so as to adjust the output power of the secondary power supply system.

[0059] In the embodiments of the present application, the duty cycle parameter refers to a value used to represent the on-time proportion of a switching device in a period in pulse width modulation (PWM) control. For example, when the duty cycle is 50%, it means that the switching device is in the on state for half of the time and in the off state for the other half of the time. The adjustment of the duty cycle parameter directly affects the on-time of the power device, thereby affecting the size of the output power.

[0060] In the embodiments of the present application, the on-time refers to the length of time that the power device is in the on state in each working period. By adjusting the on-time, the size of the output voltage and current can be controlled, and thus the output power can be adjusted.

[0061] In the embodiments of the present application, the auxiliary power supply can include a primary power supply, a secondary power supply, and an isolated power supply; the primary power supply is used to power the secondary power supply and the isolated power supply; the secondary power supply is used to power the control module and the acquisition module; and the isolated power supply is used to power the drive circuit.

[0062] In the embodiments of the present application, the auxiliary power supply can be used to provide stable power supply for each low-voltage electronic device in the secondary power supply system, to ensure normal operation thereof; and the drive circuit is mainly used to control the switching state of the high-side MOS tube, i.e., the output transistor, on the output side.

[0063] In the embodiments of the present application, by separating the auxiliary power supply from the drive circuit, the safety and reliability of the system can be improved, the influence of a fault of a certain module on the entire power supply system can be avoided, and fault diagnosis and isolation can be facilitated.

[0064] In the embodiments of the present application, the primary power supply is responsible for initially reducing the 48V input voltage to an intermediate voltage level; the secondary power supply further reduces the voltage to 12V or lower on this basis; and the isolated power supply is isolated from the main circuit through a transformer or other means, to provide a stable high-side drive voltage for the drive circuit. This layered power supply structure not only improves the power supply efficiency, but also enhances the electrical isolation between the modules, thereby improving the safety of the overall system.

[0065] In the embodiments of the present application, by separating the auxiliary power supply into a primary power supply, a secondary power supply, and an isolated power supply, and configuring different power supply objects for them, modularization and hierarchical management of the power supply system are achieved. In this way, the stability and safety of the power supply system can be improved, so that independent protection of different loads can be achieved, and thus the overall reliability of the vehicle power supply system can be improved.

[0066] In the embodiment of the present application, the drive circuit comprises a protection control port and an output transistor; the control module is further configured to send a first level signal to the protection control port when it is determined to perform the circuit off operation, and to send a second level signal to the protection control port when it is determined to perform the circuit on operation; the voltage value of the first level signal is less than that of the second level signal; the drive circuit is configured to trigger the output transistor to turn off in response to the first level signal to complete the circuit off operation, and to trigger the output transistor to turn on in response to the second level signal to complete the circuit on operation.

[0067] In the embodiment of the present application, the protection control port is an input interface in the drive circuit for receiving the control signal sent by the control module, which is used to control the switching state of the output transistor; the output transistor is a key device for controlling the on-off state of the output circuit, and the output transistor in the present application can be an N-channel metal oxide semiconductor field effect transistor (NMOS).

[0068] In the embodiment of the present application, the first level signal refers to a low level signal, usually with a voltage value of 0V or close to 0V, which is used to indicate that the output transistor enters the off state; the second level signal refers to a high level signal, for example, 5V or 12V, etc., which is used to indicate that the output transistor enters the on state; this mechanism ensures that the power supply system can operate stably under normal conditions, while having flexible switching control capability, improving system reliability.

[0069] In the embodiment of the present application, the drive circuit further comprises a first transistor, a second transistor, a third transistor and a first diode; the gate (G) of the output transistor is connected to the first transistor, the first diode is connected to the output positive voltage end of the isolation power supply, the drain (D) of the output transistor is connected to the first power pin, and the first power pin is the output power pin of the conversion circuit; the protection control port is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the first diode, the collector of the third transistor is connected to the output ground end of the isolation power supply, and the emitter of the third transistor is connected to the gate of the output transistor.

[0070] In the embodiment of the present application, the first transistor, the second transistor and the third transistor are all discrete semiconductor devices, which are used to realize high-side switching control and voltage discharge function; the first transistor and the third transistor can be PNP type bipolar transistors (BJT), and the second transistor can be NPN type bipolar transistor.

[0071] In some embodiments of the present application, the second transistor is configured to trigger off in response to the first level signal; the first transistor is configured to trigger off in response to the second transistor being off, and in a case where the emitter and the base of the first transistor are free of voltage difference; the third transistor is configured to trigger on in response to a residual voltage existing at the gate of the output transistor, and in a case where the emitter and the base of the third transistor have voltage difference; and the output transistor is configured to be off after discharging the residual voltage in response to the third transistor being on.

[0072] In embodiments of the present application, the collector of the third transistor is connected to the ground of the isolated power supply, for providing a discharge path under certain conditions. This connection ensures that when a residual voltage exists at the gate of the output transistor, it can be discharged through the third transistor, preventing false triggering or continuous conduction. This structure enhances the stability and reliability of the system, especially in complex electromagnetic environments.

[0073] In some embodiments of the present application, the second transistor is configured to trigger on in response to the second level signal; the first transistor is configured to trigger on in response to the second transistor being on, and in a case where the emitter and the base of the first transistor have voltage difference; and the output transistor is configured to trigger on in a case where the first transistor is on, and in a case where the output voltage of the isolated power supply is obtained through the first transistor and the first diode, so that the gate voltage of the output transistor is at a high level.

[0074] In embodiments of the present application, the devices in the above-mentioned driving circuit work in a mutually dependent and cooperative manner to form a complete protection control closed loop. Moreover, by using discrete transistors and diodes to construct the protection driving circuit, precise control of the output transistor can be achieved without integrated driving integrated circuits (ICs). In this way, fast response protection of the secondary power supply network can be achieved, thereby preventing abnormal conditions such as overvoltage, overcurrent, and short circuit, and significantly improving the safety and reliability of the vehicle power supply system.

[0075] In some embodiments of the present application, the control module is configured to, in a case where it is determined to perform a pre-warning operation, send a pre-warning signal to a processor of the vehicle through the communication module, so that the processor performs pre-warning prompt processing according to the pre-warning signal.

[0076] In embodiments of the present application, the communication module can be implemented based on Controller Area Network (CAN) communication or Ethernet, and the present application does not make any limitation.

[0077] In some embodiments of the present application, the early warning signal is a specific data packet generated and sent by the control module when the secondary power supply system detects an abnormal condition, such as overvoltage, undervoltage, overcurrent, overtemperature, etc., for informing the vehicle processor to take appropriate response measures; the early warning signal can include key information such as abnormal type, occurrence time, severity, etc., to facilitate the processor to make quick judgment and processing, and the early warning signal is transmitted to the main processor of the vehicle through the communication module, and the main processor can trigger the display screen prompt, sound and light alarm, or even automatically start the safety protection mechanism to prevent the fault from further expanding.

[0078] The embodiments of the present application provide a vehicle power supply system, comprising a primary power supply system for supplying power to a plurality of secondary power supply systems; a plurality of secondary power supply systems for respectively performing voltage reduction processing on the power provided by the primary power supply system to obtain reduced voltage power, and supplying power to respective secondary loads by using the reduced voltage power; wherein each secondary power supply system comprises a collection module and a control module; the collection module is used for collecting power supply information of the secondary power supply system and sending the power supply information to the control module; wherein the power supply information comprises at least one of current information, voltage information and temperature information of a circuit in the secondary power supply system; the control module is used for determining whether the circuit of the secondary power supply system has an abnormality according to the power supply information, and performing a corresponding protection operation in the case of determining that there is an abnormality; wherein the protection operation comprises at least one of a circuit shutdown operation, an output power adjustment operation and a warning operation. As can be seen, each secondary power supply system can perform voltage reduction processing on the power provided by the primary power supply system to supply power to respective secondary loads by using the reduced voltage power, thereby realizing power distribution of mutually independent secondary power supply networks; at the same time, since the collection module and the control module are arranged in each secondary power supply system, the collection module can collect power supply information in the power supply process of each secondary power supply system, and then the control module of each secondary power supply system can detect and analyze the power supply circuit of the current secondary power supply system to determine whether the power supply circuit has an abnormality, and if there is an abnormality, the control module can perform any one of the protection operations including circuit shutdown, output power adjustment and warning, thereby realizing independent fault detection and protection of each secondary power supply system, and greatly improving the safety of the power supply network of the whole vehicle.

[0079] Based on the above embodiments, in another embodiment of the present application, a control method of a vehicle power supply system is provided, which is applied to the vehicle power supply system; as shown in the method comprises the following steps: Figure 4 Step 1001, a plurality of secondary power supply systems respectively perform voltage reduction processing on the power provided by the primary power supply system to obtain reduced voltage power, and supply power to respective secondary loads by using the reduced voltage power; wherein each secondary power supply system comprises a collection module and a control module.​

[0080] In the embodiment of the present application, the plurality of secondary power supply systems in the vehicle power supply system can respectively step down the electrical energy provided by the primary power supply system to obtain stepped-down electrical energy, and supply power to the respective secondary loads by using the stepped-down electrical energy; wherein each secondary power supply system comprises an acquisition module and a control module.

[0081] In the embodiment of the present application, the primary power supply system can be used to supply power to the plurality of secondary power supply systems.

[0082] In the embodiment of the present application, the secondary power supply system comprises a conversion circuit; the conversion circuit comprises a conversion controller and a power device array; the control module can send an updated duty cycle parameter to the conversion controller in the case of determining to perform an output power adjustment operation; the conversion controller can control the turn-on time of each power device in the power device array according to the updated duty cycle parameter to adjust the output power of the secondary power supply system.

[0083] In the embodiment of the present application, when the secondary power supply system steps down the electrical energy provided by the primary power supply system, the conversion circuit can be used to complete the step-down process to obtain the stepped-down electrical energy.

[0084] Step 1002, the acquisition module acquires the power supply information of the secondary power supply system and sends the power supply information to the control module; wherein the power supply information comprises at least one of the current information, the voltage information and the temperature information of the circuit in the secondary power supply system.

[0085] In the embodiment of the present application, after the plurality of secondary power supply systems in the vehicle power supply system respectively step down the electrical energy provided by the primary power supply system to obtain stepped-down electrical energy, and supply power to the respective secondary loads by using the stepped-down electrical energy, the acquisition module in each secondary power supply system can acquire the power supply information of the secondary power supply system and send the power supply information to the control module; wherein the power supply information comprises at least one of the current information, the voltage information and the temperature information of the circuit in the secondary power supply system.

[0086] Step 1003, the control module determines whether the circuit of the secondary power supply system is abnormal according to the power supply information, and performs a corresponding protection operation in the case of determining that there is an abnormality; wherein the protection operation comprises at least one of a circuit shutdown operation, an output power adjustment operation and a pre-warning operation.

[0087] In the embodiment of the present application, after the acquisition module in the secondary power supply system acquires the power supply information of the secondary power supply system and sends the power supply information to the control module, the control module can determine whether the circuit of the secondary power supply system is abnormal according to the power supply information, and in the case of determining that there is an abnormality, perform corresponding protection operation; wherein the protection operation includes at least one of the circuit shutdown operation, the output power adjustment operation and the early warning operation.

[0088] The embodiment of the present application provides a control method of a vehicle power supply system, which is applied to a vehicle power supply system, and the vehicle power supply system includes a primary power supply system and a plurality of secondary power supply systems; the plurality of secondary power supply systems in the vehicle power supply system respectively perform step-down processing on the electric energy provided by the primary power supply system, obtain the step-down electric energy, and supply power to respective secondary loads by using the step-down electric energy; wherein each secondary power supply system includes an acquisition module and a control module; the acquisition module acquires power supply information of the secondary power supply system and sends the power supply information to the control module; wherein the power supply information includes at least one of current information, voltage information and temperature information of the circuit in the secondary power supply system; the control module determines whether the circuit of the secondary power supply system is abnormal according to the power supply information, and in the case of determining that there is an abnormality, performs corresponding protection operation; wherein the protection operation includes at least one of the circuit shutdown operation, the output power adjustment operation and the early warning operation. As can be seen, each secondary power supply system can perform step-down processing on the electric energy provided by the primary power supply system to supply power to respective secondary loads by using the step-down electric energy, thereby realizing power distribution of mutually independent secondary power supply networks; at the same time, since the acquisition module and the control module are arranged in each secondary power supply system, the acquisition module can be used to acquire the power supply information in the power supply process of each secondary power supply system, and then the control module of each secondary power supply system can perform abnormality detection and analysis on the power supply circuit of the current secondary power supply system to determine whether the power supply circuit is abnormal, and if there is an abnormality, control to perform corresponding protection operation, including any one of the circuit shutdown, the output power adjustment and the early warning, to realize independent fault detection and protection of each secondary power supply system, greatly improving the power supply network safety of the whole vehicle.

[0089] Based on the above embodiment, in another embodiment of the present application, exemplary as Figure 5As shown, the whole vehicle secondary power supply area is divided into three independent areas of front cabin, middle cabin and rear cabin, and one independent secondary DCDC module (secondary power supply system) is arranged in each area to be responsible for power distribution and protection of the secondary controller and load in the area. In this way, independent control and protection of different areas can be realized, and the normal operation of other areas is avoided when a fault occurs in a certain area. At the same time, in view of the problem that there is currently a lack of integrated drive chip suitable for 48V system, the application adopts a discrete circuit scheme to construct a drive circuit with active high-side drive, thereby realizing effective control of the output end. In addition, through real-time monitoring of parameters such as voltage, current and temperature, combined with comprehensive judgment of the MCU, rapid response to abnormal conditions can be realized, thereby improving the stability and safety of the whole vehicle power supply system.

[0090] As shown in Figure 6 , the primary power supply system can include a 48V battery and a 48V DCDC converter, and can supply power to a plurality of secondary power supply systems and 48V loads and controllers; the plurality of secondary power supply systems can include a first power supply system for supplying power to the loads and controllers of the front cabin, a second power supply system for supplying power to the loads and controllers of the middle cabin, and a third power supply system for supplying power to the loads and controllers of the rear cabin.

[0091] Exemplarily, as shown in Figure 7 , the secondary power supply system is provided with protection logic for performing voltage protection, current protection and temperature protection, so that during the process of the secondary power supply system supplying power to the corresponding 12V load and controller, the corresponding protection operation can be performed by acquiring relevant power supply information.

[0092] In some embodiments of the application, the whole vehicle wiring harness is divided into a primary power supply 48V harness and a secondary power supply 12V harness, and in the whole vehicle power distribution, the 48V power supply controller and load are directly connected by 48V, and the secondary DCDC is a 48V load or controller in the primary power supply network. Each area's secondary DCDC is responsible for the secondary power distribution of the respective area, manages and protects the secondary power distribution of the area, and the primary and secondary power supply network harnesses of the whole vehicle wiring realize wiring isolation and do not interfere with each other, solving the problem of common wiring of different power supplies.

[0093] In some embodiments of the present application, in each secondary DCDC, the voltage, current and temperature of each power output to the secondary controller and load are detected respectively, and the detection results are transmitted to the MCU to realize real-time monitoring of each output; when overvoltage, undervoltage, overcurrent, overload, overtemperature and other conditions are detected in one or more paths, the MCU executes corresponding protection strategies according to different fault types; for overvoltage and undervoltage conditions, pre-warning, output shutdown and other protection measures are given according to the detected voltage values; for output overcurrent and overload conditions, power reduction, output shutdown, pre-warning and other protection measures are taken; for overtemperature conditions, power reduction and output shutdown protection measures are mainly taken.

[0094] In some embodiments of the present application, the secondary DCDC mainly consists of a conversion circuit, an auxiliary power supply, an MCU and a drive circuit; the conversion circuit can be used to complete the core function of converting 48V to 12V, the auxiliary power supply consists of a primary power supply, a secondary power supply and an isolation power supply, the primary power supply realizes primary voltage reduction and serves as the input of the secondary power supply and the isolation power supply, the secondary system power supply supplies power to the MCU and the acquisition module; the isolation power supply is mainly used to provide active high-side drive power for the drive circuit; the drive circuit is built with discrete circuits (diodes and transistors) to solve the problem of lack of active high-side shutdown drive IC in the current automotive 48V system, the drive circuit can use higher voltage grades, and the opening and closing control of the output is realized by controlling the high-side MOS tube (output transistor) to protect the rear-end load; in the acquisition module, voltage acquisition can use a resistor voltage division scheme, and output current can be acquired by building a differential circuit with an operational amplifier. The limited power output is realized by changing the PWM duty cycle of the voltage reduction MOS array through the DCDC controller (conversion controller) controlled by the MCU through its SPI and mode control port.

[0095] In some embodiments of the present application, as shown in Figure 8 When the protection control port of the drive circuit receives a high-level signal, the transistor 34 is turned on, the CE pole is turned on, the EB pole of the transistor 26 generates a voltage difference, the transistor 26 is turned on, the isolation VCC power supply passes through the transistor 26 and the diode 31 to the G pole of the MOS tube 32, the output MOS tube 32 (output transistor) is turned on to realize the conduction control of the output circuit; when the protection control port receives a low level, the transistor 34 is turned off, the voltage difference of the EB pole of the transistor 26 disappears, the transistor 26 is turned off, and since there is voltage at the G pole of the MOS tube 32 which is turned on last time, there is a voltage difference at the EB pole of the transistor 36, the transistor 36 is turned on, the EC pole is turned on, the G pole voltage of the MOS tube is discharged to turn off the output MOS tube 32.

[0096] It should be noted that the drive circuit belongs to the automobile active high-side drive scheme, and there is currently no related automobile-level drive IC available in the 48V system. The scheme is realized by discrete devices and can meet the application requirements of 48V or even higher voltage platforms.

[0097] In some embodiments of the present application, as shown in Figure 9 The secondary power supply system can first initialize the MCU (step 201), then read the feedback voltage, current and temperature through the control module (step 202), then judge whether the voltage is normal (step 203), whether the current is normal (step 204), and whether the temperature is normal (step 205), and perform protection operation according to the judgment result whether there is an abnormality (step 206). For example, when one or more outputs of the secondary power supply system supplying power to the load appear abnormal, the control module can control to perform protection operations such as closing the circuit, reducing power and warning. As can be seen, the embodiments of the present application can change the software without increasing the cost, report the power supply information of each power consumption component through CAN communication or Ethernet, etc., realize higher level power supply protection through verification and diagnosis, thereby independently control each output, realize isolation and protection of the fault control unit, realize precise power supply control of the secondary power supply network to the fault control unit, and improve the safety of the overall power supply network.

[0098] Exemplarily, as shown in the foregoing Figure 3 The conversion circuit can include a conversion controller, a power device array, and some capacitors, inductors, diodes, and resistors, etc. The three capacitors numbered 9, 10, and 11 are electrolytic capacitors, and the two capacitors numbered 12 and 13 are ceramic capacitors. The conversion controller can be a chip, which can include multiple ports and pins, such as a mode control port, a serial peripheral interface (SPI) port, and a fault feedback port. The SPI port can include four ports: SPI_CS, SPI_SCL, SPI_SDA, and SPI_CLK. The updated duty cycle parameters sent by the control module can be received through the mode control port and the SPI port to control the power output. VBAT_48V is an input power pin connected to a 48V DC input voltage. V_AWO is also a power pin used to charge the self-capacitor numbered 5 to turn on the transistors numbered 2, 3, and 4 in the power device array. VBAT_12V is an output power pin that can output a stable 12V DC voltage after voltage conversion. GND is a ground pin that provides a common reference ground for the entire circuit to ensure stable circuit potential.

[0099] Exemplarily, asFigure 10 As shown, for the circuit structure of the primary power supply and the secondary power supply of the auxiliary power supply, it can also include two chips for controlling the primary power supply and the secondary power supply, for a plurality of pins, SW is a switch pin, FB is a feedback pin, VCC_XT_12V is a voltage output node, which is a stable 12V voltage output by the primary power supply after step-down conversion and filtering (23, 24, 27, 28, etc. Participate), provide input power for the "linear voltage regulator chip" circuit of the secondary power supply, and is an intermediate voltage identifier of power distribution and transmission in the system.

[0100] As shown in the example, Figure 11 As shown, for the circuit structure of the isolated power supply, it can also include a control IC of the isolated power supply, 8 represents a transformer, and isolated VCC is the positive voltage end of the isolated power supply output, and isolated VSS is the ground end or negative voltage reference end of the isolated power supply output.

[0101] As shown in the example, Figure 12 As shown, in the circuit structure of the control module, the control module can be connected with the communication module, and the communication module can be constructed based on CAN communication; the MCU of the control module can include a mode control port, a fault feedback port, and an SPI port, etc., for outputting related control signals to the conversion circuit; it can also include a port for sending a level signal to the protection control port of the drive circuit; the control module can also include a transistor temperature sampling circuit and a conversion circuit output voltage collection circuit.

[0102] As shown in the example, Figure 8 As shown in the example, the circuit structure of the drive circuit can include transistors, resistors, diodes, fuses, and capacitors, etc. The drive circuit can also be provided with an output current sampling circuit for collecting current in the drive circuit and sending it to the MCU of the control module. The output current sampling circuit can include an operational amplifier.

[0103] In summary, the present application proposes a new power distribution network structure and corresponding safety control strategy in view of the defects existing in the current automobile power distribution system. By deploying the secondary power supply system in different areas and setting the corresponding circuit protection, the safety problems existing in the primary and secondary power supply network wiring can be effectively solved, and effective safety protection can be realized without the need for a redundant scheme. The secondary power supply can effectively protect against overvoltage, overcurrent, and overtemperature abnormalities.

[0104] In addition, each functional module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional module.

[0105] The integrated unit, if realized in the form of a software functional module and not sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiment can be embodied in the form of a software product, the computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the embodiment method. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0106] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can be in the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer usable program codes.

[0107] The present application is described with reference to the implementation flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram and the combination of the flows and / or blocks can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a machine that implements the function specified in the flowchart and / or block diagram. Figure 1 The function specified in one flow or multiple flows and / or blocks Figure 1 The device that realizes the function specified in one block or multiple blocks.

[0108] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flowchart or flowsheet and / or block Figure 1 of the flowchart or flowsheet and / or block of the flowchart or flowsheet and / or block

[0109] of the flowchart or flowsheet and / or block Figure 1 function specified in the flowchart or flowsheet and / or block Figure 1 of the flowchart or flowsheet and / or block of the flowchart or flowsheet and / or block

[0110] The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Any equivalent replacement or transformation made by those skilled in the art based on the present application shall fall within the protection scope of the present application.

Claims

1. A vehicle power supply system characterized by comprising: The vehicle power supply system comprises: a primary power supply system for supplying power to a plurality of secondary power supply systems; the plurality of secondary power supply systems are respectively configured to step down the power provided by the primary power supply system to obtain stepped-down power, and supply power to respective secondary loads by using the stepped-down power; wherein each secondary power supply system comprises a collection module and a control module; the collection module is configured to collect power supply information of the secondary power supply system and send the power supply information to the control module; wherein the power supply information comprises at least one of current information, voltage information and temperature information of a circuit in the secondary power supply system; the control module is configured to determine whether the circuit of the secondary power supply system is abnormal according to the power supply information, and perform a corresponding protection operation in the case of determining that there is an abnormality; wherein the protection operation comprises at least one of a circuit shutdown operation, an output power adjustment operation and a pre-warning operation.

2. The vehicle power supply system according to claim 1, characterized by The secondary power supply system comprises a conversion circuit; the conversion circuit comprises a conversion controller and a power device array; the control module is further configured to send an updated duty cycle parameter to the conversion controller in the case of determining to perform the output power adjustment operation; the conversion controller is configured to control the turn-on time of each power device in the power device array according to the updated duty cycle parameter to adjust the output power of the secondary power supply system.

3. The vehicle power supply system according to claim 2, characterized by The secondary power supply system comprises an auxiliary power supply and a drive circuit; the auxiliary power supply comprises a primary power supply, a secondary power supply and an isolation power supply; the primary power supply is configured to supply power to the secondary power supply and the isolation power supply; the secondary power supply is configured to supply power to the control module and the collection module; the isolation power supply is configured to supply power to the drive circuit.

4. The vehicle power supply system according to claim 3, characterized by The drive circuit comprises a protection control port and an output transistor; the control module is further configured to send a first level signal to the protection control port in the case of determining to perform the circuit shutdown operation; and send a second level signal to the protection control port in the case of determining to perform the circuit turn-on operation; wherein the voltage value of the first level signal is less than the voltage value of the second level signal; the drive circuit is configured to trigger the output transistor to turn off in response to the first level signal to complete the shutdown operation of the output circuit; and trigger the output transistor to turn on in response to the second level signal to complete the turn-on of the output circuit. ​ 5. The vehicle power supply system according to claim 4, characterized by The driving circuit further comprises a first transistor, a second transistor, a third transistor and a first diode; the gate of the output transistor is connected to the first transistor, the first diode is connected to the output positive voltage end of the isolation power supply, the drain of the output transistor is connected to a first power pin, and the first power pin is an output power pin of the conversion circuit; the protection control port is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the first diode, the collector of the third transistor is connected to the output ground end of the isolation power supply, and the emitter of the third transistor is connected to the gate of the output transistor; The second transistor is configured to be triggered off in response to the first level signal; The first transistor is configured to be triggered off in response to the second transistor being off, and the emitter and the base of the first transistor have no voltage difference; The third transistor is configured to be triggered on in response to the gate of the output transistor having a residual voltage, and the emitter and the base of the third transistor have a voltage difference; The output transistor is configured to be turned off after the residual voltage is discharged in response to the third transistor being turned on.

6. The vehicle power supply system according to claim 5, wherein The second transistor is configured to be turned on in response to the second level signal; The first transistor is configured to be triggered on in response to the second transistor being turned on, and the emitter and the base of the first transistor have a voltage difference; The output transistor is configured to be triggered on in the case that the first transistor is turned on, to obtain the output voltage of the isolation power supply through the first transistor and the first diode, and to have the gate voltage of the output transistor in a high level state.

7. The vehicle power supply system according to any one of claims 1 to 6, characterized by The secondary power supply system further comprises a communication module; The control module is configured to send a warning signal to a processor of the vehicle through the communication module in the case that it is determined to perform a warning operation, so that the processor performs a warning prompt process according to the warning signal.

8. The vehicle power supply system according to any one of claims 1 to 6, characterized by The plurality of secondary power supply systems comprises a first power supply system arranged in a front cabin of the vehicle, a second power supply system arranged in a middle cabin of the vehicle, and a third power supply system arranged in a rear cabin of the vehicle.

9. A control method of a vehicle electric power supply system, characterized by, The method is applied to a vehicle power supply system, and the vehicle power supply system comprises a primary power supply system and a plurality of secondary power supply systems; the method comprises: The plurality of secondary power supply systems respectively perform voltage reduction processing on the electrical energy provided by the primary power supply system, to obtain reduced electrical energy, and supply power to respective secondary loads by using the reduced electrical energy; wherein each secondary power supply system comprises a collection module and a control module; The collection module collects power supply information of the secondary power supply system, and sends the power supply information to the control module; wherein the power supply information comprises at least one of current information, voltage information and temperature information of a circuit in the secondary power supply system; The control module determines whether an abnormality exists in the circuit of the secondary power supply system according to the power supply information, and performs a corresponding protection operation in a case where it is determined that an abnormality exists; wherein the protection operation includes at least one of a circuit shutdown operation, an output power adjustment operation, and a pre-warning operation.

10. A vehicle characterized by comprising: The vehicle power supply system according to any one of claims 1 to 8; the vehicle power supply system configured to execute the control method of the vehicle power supply system according to claim 9.

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